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ASF GitHub Bot logged work on TS-4042: -------------------------------------- Author: ASF GitHub Bot Created on: 16/Aug/16 02:22 Start Date: 16/Aug/16 02:22 Worklog Time Spent: 10m Work Description: Github user bryancall commented on a diff in the pull request: https://github.com/apache/trafficserver/pull/351#discussion_r74867804 --- Diff: plugins/request_buffer/request_buffer.cc --- @@ -0,0 +1,119 @@ +/* request_buffer.cc - Plugin to enable request buffer for the given transaction. + */ + +#include <ctype.h> +#include <stdio.h> +#include <string.h> +#include <time.h> +#include <string> + +#include "ts/ts.h" +#include "ts/ink_defs.h" + +#define PLUGIN_NAME "request_buffer" + +static const int MIN_BYTE_PER_SEC = 1000; +static int TXN_INDEX_ARG_TIME; +struct TimeRecord { + timespec start_time; + TimeRecord() { clock_gettime(CLOCK_MONOTONIC, &start_time); } +}; +bool +is_post_request(TSHttpTxn txnp) +{ + const char *method; + int method_len; + TSMLoc req_loc; + TSMBuffer req_bufp; + if (TSHttpTxnClientReqGet(txnp, &req_bufp, &req_loc) == TS_ERROR) { + TSError("Error while retrieving client request header\n"); + return false; + } + method = TSHttpHdrMethodGet(req_bufp, req_loc, &method_len); + if (static_cast<size_t>(method_len) != strlen(TS_HTTP_METHOD_POST) || strncasecmp(method, TS_HTTP_METHOD_POST, method_len) != 0) { + TSHandleMLocRelease(req_bufp, TS_NULL_MLOC, req_loc); + return false; + } + TSHandleMLocRelease(req_bufp, TS_NULL_MLOC, req_loc); + return true; +} +bool +reached_min_speed(TSHttpTxn txnp, int body_len) +{ + TimeRecord *timeRecord = (TimeRecord *)TSHttpTxnArgGet(txnp, TXN_INDEX_ARG_TIME); + timespec now_time; + clock_gettime(CLOCK_MONOTONIC, &now_time); + double time_diff_in_sec = + (now_time.tv_sec - timeRecord->start_time.tv_sec) + 1e-9 * (now_time.tv_nsec - timeRecord->start_time.tv_nsec); + TSDebug("http", "time_diff_in_sec = %f, body_len = %d, date_rate = %f\n", time_diff_in_sec, body_len, + body_len / time_diff_in_sec); + return body_len / time_diff_in_sec >= MIN_BYTE_PER_SEC; +} +static int +hook_handler(TSCont contp, TSEvent event, void *edata) +{ + TSHttpTxn txnp = (TSHttpTxn)(edata); + if (event == TS_EVENT_HTTP_READ_REQUEST_HDR && is_post_request(txnp)) { + // enable the request body buffering + TSHttpTxnConfigIntSet(txnp, TS_CONFIG_HTTP_REQUEST_BUFFER_ENABLED, 1); + + // save the start time for calculating the data rate + TimeRecord *timeRecord = new TimeRecord(); + TSHttpTxnArgSet(txnp, TXN_INDEX_ARG_TIME, static_cast<void *>(timeRecord)); + + TSHttpTxnHookAdd(txnp, TS_HTTP_REQUEST_BUFFER_READ_HOOK, TSContCreate(hook_handler, TSMutexCreate())); + TSHttpTxnHookAdd(txnp, TS_HTTP_REQUEST_BUFFER_READ_COMPLETE_HOOK, TSContCreate(hook_handler, TSMutexCreate())); + TSHttpTxnHookAdd(txnp, TS_HTTP_TXN_CLOSE_HOOK, TSContCreate(hook_handler, TSMutexCreate())); + } else if (event == TS_EVENT_HTTP_REQUEST_BUFFER_READ || event == TS_EVENT_HTTP_REQUEST_BUFFER_COMPLETE) { + int64_t ret_len = TSHttpTxnClientReqBodyBytesGet(txnp); + if (event == TS_EVENT_HTTP_REQUEST_BUFFER_READ && !reached_min_speed(txnp, ret_len)) { + TSError("[hook_handler] Error : reached_min_speed checking failed\n"); + TSHttpTxnReenable(txnp, TS_EVENT_ERROR); + return 0; + } + + // get the received request body + TSIOBufferReader buffer_reader = TSHttpTxnGetClientRequestBufferReader(txnp); + int64_t read_avail = TSIOBufferReaderAvail(buffer_reader); + if (read_avail) { + char *body = (char *)TSmalloc(sizeof(char) * read_avail); + int64_t consumed = 0; + int64_t data_len = 0; + const char *char_data = NULL; + TSIOBufferBlock block = TSIOBufferReaderStart(buffer_reader); + while (block != NULL) { + char_data = TSIOBufferBlockReadStart(block, buffer_reader, &data_len); + memcpy(body + consumed, char_data, data_len); + consumed += data_len; + block = TSIOBufferBlockNext(block); + } + // play with the body --- End diff -- Why are you copying the body if you aren't doing anything with it? Issue Time Tracking ------------------- Worklog Id: (was: 26482) Time Spent: 10m Remaining Estimate: 0h > Add feature to buffer request body before making downstream requests > -------------------------------------------------------------------- > > Key: TS-4042 > URL: https://issues.apache.org/jira/browse/TS-4042 > Project: Traffic Server > Issue Type: Improvement > Components: Core, CPP API, TS API > Reporter: Brian Geffon > Assignee: Brian Geffon > Fix For: 7.0.0 > > Time Spent: 10m > Remaining Estimate: 0h > > We need a way to examine the request body without making a downstream > request, this feature has many use cases including: > - Ability to buffer the body and ensure a full post is received before > committing downstream resources. > - Ability to choose an origin based on request body > - Ability to do request content filtering such as a WAF might provide > before the origin is involved. > Today you have two options to inspect a request body: > 1) Transformations: the problem with transformations is that you only start > receiving the request bytes after a sink has been established, which in this > case is the downstream origin. > 2) Create an intercept and use fetch apis to then send the downstream > request: while this technically works it turns out to be a ton of code and is > in general pretty problematic, we actually tried this approach for a while > and had nothing but problems with it. > We feel it would be ideal if we could intercept the body without breaking the > normal ATS state flow. There used to exist code (and it's still in the core > just #ifdefed out) to drain the request body. I use that code as the basis > for this request buffering code. We added APIs to both the C and C++ APIs so > that this request buffering can be enabled from a plugin and the plugin can > inspect the body as chunks arrive or when it's complete. We've included an > example plugin that will error a transaction if a minimum rate of transfer is > not maintained. > I'm confident that this feature will bring plenty of questions / feedback, so > let's get that party started. -- This message was sent by Atlassian JIRA (v6.3.4#6332)